TWM675649U - System for preparing iron oxide from recycled iron material in waste waterjet cutting abrasives - Google Patents

Abstract

A system for preparing iron oxide from recycled iron material in waste waterjet cutting abrasives involves the following steps: The system collects the finely crushed waste sand and processes it through various stages including drying, air classification, washing, magnetic separation, screening, soaking, dehydration, and drying. During the process, a strong oxidizing agent is added to oxidize the iron sand to produce iron oxide and ferrous oxide powders.

Description

Preparation system for recovering iron from waste sand of water jet cutting consumables to produce iron oxide

This new technology relates to recycling technology, specifically a system for recovering iron from waste sand produced by water jet cutting consumables to produce iron oxide.

The consumable material commonly used in water jet cutting is garnet abrasive, which contains metal materials such as silicon, iron, and aluminum. However, due to its high hardness, typically exceeding 7.5, garnet abrasive is typically used in water jet cutting for hard materials such as marble and steel. The waste sand produced after the garnet abrasive is ejected by the water jet is typically collected and discarded.

However, as mentioned above, because pomegranate sand also contains metals such as iron and aluminum, it should be recycled. The remaining silicon can be further processed to form abrasive materials for precision industry.

The main purpose of this new device is to provide a system for recovering iron from waste sand produced by water jet cutting consumables to produce iron oxide. The system collects the waste sand produced by water jet cutting and oxidizes it to produce iron oxide powders such as ferric oxide and ferrous oxide.

Therefore, this new technology uses pomegranate sand in water jet equipment to cut hard materials such as marble and steel. The pomegranate sand (gold steel sand) is ejected at high speed by the water jet and impacts the hard material, continuously breaking and pulverizing it during the impact process. The fine waste sand is collected and then subjected to various processes, including drying, air separation, washing, magnetic separation, screening, soaking, dehydration, and drying. During this process, a strong oxidant is added to oxidize the resulting iron sand to produce metal powders such as iron oxide and ferrous oxide.

In this embodiment, a screening machine with a #120 mesh, a #170 mesh, and a #200 mesh is used to screen the powder, yielding iron-based metal powders with Distribution 90 (hereinafter referred to as D90) particle sizes of 125 μm, 90 μm, and 75 μm, respectively.

In this novel embodiment, the obtained iron-group metal powder is immersed in an aqueous solution of ozone, sodium hydroxide, wood ash, or paper ash, with the aforementioned components present in a ratio of 5-10%, for approximately 24-48 hours. The oxygen is then exchanged with the iron-group metal powder over time, resulting in iron oxide powder or ferrous oxide powder.

Based on the above description, the features and functions of this new model are briefly described as follows:

1. This new technology processes waste sand from water jet cutting through various processes, including drying, air separation, cleaning, magnetic separation, screening, soaking, dehydration, and drying. A strong oxidant is added at various stages to oxidize the resulting iron sand, producing metal powders such as ferric oxide and ferrous oxide. Residual materials, such as silicon or ceramics, can be recycled and sintered to form abrasive materials for precision industry use. The resulting iron group metal powder can then be used in other industries and processing applications.

2. Compared to the conventional method of classifying waste sand solely by particle size, the metal powder obtained by this new technology has better purity.

S1: Step 1

S2: Step 2

S3: Step 3

S4: Step 4

S5: Step 5

S6: Step 6

S7: Step 7

S8: Step 8

S9: Step 9

A1: Recovery device

A2: Dryer

A3:Wind Sorting Machine

A4: Ultrasonic Cleaning Machine

A5: Magnetic Separator

A6: Screening Machine

A7: Container

A8: Dehydrator

Figure 1: Flowchart of this new model.

Figure 2: System diagram of this new model.

As shown in Figures 1 and 2, the present invention is a preparation system for recovering iron materials from waste sand of water jet cutting consumables to produce iron oxide, including: As shown in Figures 1 and 2, step 1 (S1): using a recovery device A1 to collect the waste sand after water jet cutting. In detail, pomegranate sand is a cutting consumable commonly used in water jet equipment. Pomegranate sand is pressurized by the water jet equipment and mixed with water. After passing through an ultra-high pressure booster, the water is pressurized to 25,000~80,000psi, and then ejected through a nozzle with a diameter of only 0.01mm to 0.04mm to achieve supersonic water flow. At this time, the pomegranate sand mixed in the water is ejected at high speed and hits the water. When the sand strikes hard objects like marble and steel, the high-speed collision process causes the pomegranate sand to continuously break and pulverize. After repeated recycling and reuse in the water jet equipment, after approximately 5-10 high-speed jet impacts, the pomegranate sand is broken into particles approximately 125um to 75um in size, becoming waste sand and unable to be reused as consumables. This results in pomegranate sand waste.

As shown in Figures 1 and 2, Step 2 (S2): The first drying step is performed using a dryer A2 located after the recovery unit A1. The dryer A2 is located after the recovery unit A1 to reduce the moisture content of the resulting pomegranate waste sand to below 5%, achieving dryness.

During the first drying process, the drying method can be sun exposure, heat drying, natural drying, or any combination of the above methods.

As shown in Figures 1 and 2, step 3 (S3): air separation. Air separator A3, located after dryer A2, blows compressed air through the dried pomegranate sand waste sand to separate light impurities from dust and other low-density materials. The air separator A3 is installed after dryer A2. Specifically, after the air separation step, compressed air is typically applied at a pressure not exceeding 1 MPa. This step aims to remove light impurities and dust, using air as a separation medium to separate light materials from heavier materials. This typically separates the light fraction with low density and high air resistance, which are the unwanted light impurities and dust, from the heavy fraction with high density and low air resistance, which are the desired fine metal powder. The air-separated fraction then proceeds to the next stage.

As shown in Figures 1 and 2, Step 4 (S4): Cleaning: The ultrasonic cleaning machine A4 located after the air separator A3 uses ultrasound to clean the fine metal powder that has been air-separated. This fine metal powder may contain some oil or contaminants. The ultrasonic cleaning machine A4 is installed after the air separator A3.

During the cleaning process, use an ultrasonic machine at 40KHz, a cleaning temperature of 40-60°C, and a cleaning time of 30-40 minutes.

As shown in Figures 1 and 2, Step 5 (S5): Magnetic Separation: The cleaned fine metal powder is separated from the ultrasonic cleaning machine A4 using a magnetic separator A5 to separate the ferrous metals. The magnetic separator A5 is installed after the ultrasonic cleaning machine A4.

During the magnetic separation step, the magnetic separation intensity is set between 3000 and 5000 Gauss. Within this Gauss intensity range, iron-based metal powder can be obtained from fine metal powder.

As shown in Figures 1 and 2, Step 6 (S6): Particle size screening. The obtained iron-based metal powder is screened by particle size classification using the screen A6 located after the magnetic separator A5, thereby obtaining iron-based metal powders of different particle sizes. The screen A6 is installed after the magnetic separator A5.

During the particle size screening step, the powder is screened using a sieve with #120 mesh, #170 mesh, and #200 mesh, yielding Distribution 90 (hereinafter referred to as D90) iron-based metal powders with particle sizes of 125μm, 90μm, and 75μm, respectively.

As shown in Figures 1 and 2, step 7 (S7): Immersion oxidation. Prepare a container A7 to immerse the iron-based metal powder from the aforementioned screener A6 in an oxidizing solution to replace oxygen with the iron-based metal powder, thereby obtaining an iron oxide powder solution or a ferrous oxide powder solution. The container A7 is placed after the screener A6. The chemical formula of the obtained iron oxide powder solution is as follows: _O2 + ^4e- + _2H2O → 4OH

Fe→Fe ₂ ++2e-

4 Fe ₂ ++O ₂ →4 Fe ₃ ++2O ₂ -

During the soaking oxidation step, the iron-based metal powder is immersed in an oxidizing solution. The oxidizing solution is a mixture of ozone, sodium hydroxide, wood ash, and paper ash mixed in an aqueous solution. The ratio of each component ranges from 5 to 10%, and the soaking time is between 24 and 48 hours.

As shown in Figures 1 and 2, step 8 (S8): Dehydration. Dehydrator A8 is located behind container A7. The iron oxide powder solution or ferrous oxide powder solution is placed in dehydrator A8 for dehydration. Dehydrator A8 is located behind container A7.

During the dehydration step, the initial centrifugal dehydration speed is set at 200 rpm for 1 minute, then increased to 400 rpm for 3 minutes, then to 800 rpm for 3 minutes, and finally to 1300 rpm for 5 minutes. Finally, the powder is removed from the dehydrator A8, resulting in iron oxide and ferrous oxide powders with a moisture content of 10-20%.

As shown in Figure 1, step 9 (S9): Second drying, the dehydrated iron oxide powder and ferrous oxide powder are dried again using dryer A2 to reduce the moisture content to less than 1% to 5%, resulting in pure iron oxide powder and ferrous oxide powder products.

During the second drying step, the drying method can be sun exposure, heat drying, natural drying in the shade, or any combination of the above methods.

In addition, the remaining waste sand that does not contain metal materials is basically silicon or ceramic materials. After further refinement and sintering, it becomes abrasive materials used in precision industries.

In summary, this new invention has not been mentioned in any publications or has been publicly used. It truly meets the requirements for a new invention patent application. We earnestly request the Bureau to review this invention and grant the patent as soon as possible. We would be most grateful.

It should be noted that the above description is a specific embodiment of the present invention and the technical principles employed. Any modifications based on the concept of the present invention that still produce functions that do not exceed the spirit of the description and drawings should be stated within the scope of the present invention.

A1: Recovery device

A2: Dryer

A3:Wind Sorting Machine

A4: Ultrasonic Cleaning Machine

A5: Magnetic Separator

A6: Screening Machine

A7: Container

A8: Dehydrator

Claims (6)

A preparation system for recovering iron from waste sand of water jet cutting consumables to produce iron oxide, comprising: a recovery device for recovering pomegranate sand waste sand generated by water jet cutting equipment; a dryer, arranged after the recovery device, for drying the pomegranate sand waste sand collected by the recovery device to remove moisture; a winnowing machine, arranged after the dryer, for passing the dried pomegranate sand waste sand through the compressed air of the winnowing machine to remove light impurities and dust; an ultrasonic cleaning machine, arranged after the winnowing machine, for passing the pomegranate sand waste sand through the ultrasonic cleaning machine to clean it to remove oil or pollutants; a magnetic separator, arranged after the ultrasonic cleaning machine, for passing the pomegranate sand waste sand through the magnetic separator to separate iron The invention relates to a process for screening and separating metalloids; a screening machine installed after the magnetic separator, through which the magnetically separated iron metal powder is passed for classification and screening, thereby obtaining iron metal powders of different particle sizes; a container installed after the screening machine, into which the iron metal powder after particle size screening is placed, and an oxidizing solution is poured to obtain an iron oxide powder solution or a ferrous oxide powder solution; a dehydrator installed after the container, through which the iron oxide powder solution or the ferrous oxide powder solution is passed for dehydration; and the dryer mentioned above further dries the dehydrated iron oxide powder solution or the ferrous oxide powder solution to obtain pure iron oxide powder or ferrous oxide powder finished product. A system for producing iron oxide by recovering iron from waste sand of water jet cutting consumables as described in claim 1, wherein the compressed air pressure of the air separator does not exceed 1 MPa. A system for preparing iron oxide from waste sand of water jet cutting consumables as described in claim 1, wherein the ultrasonic cleaning machine operates at 40 kHz, a cleaning temperature of 40-60°C, and a cleaning time of 30-40 minutes. A preparation system for producing iron oxide by recovering iron material from waste sand of water jet cutting consumables as described in claim 1, wherein the magnetic separator sets the magnetic separation intensity to 3000 to 5000 gauss. Within this gauss intensity range, iron-based metal powder can be obtained from fine metal powder. A system for producing iron oxide from iron waste recovered from water jet cutting consumables as described in claim 1, wherein the screening machine uses screens with a mesh size of #120, a mesh size of #170, and a mesh size of #200 to obtain iron-based metal powders with three particle sizes (Distribution 90) of 125 μm, 90 μm, and 75 μm, respectively. A system for recovering iron from waste sand of water jet cutting consumables to produce iron oxide as described in claim 1, wherein the dehydrator speed is initially set at 200 rpm/1 minute, then increased to 400 rpm/3 minutes, then further increased to 800 rpm/3 minutes, and finally to 1300 rpm/5 minutes. Finally, the centrifuge is removed to obtain iron oxide powder and ferrous oxide powder containing 10-20% moisture.